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hello everyone this is part one on how

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to make a tower defense game and scratch

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in this tutorial I'll be creating the

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enemies as well as the paths for the

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enemies to follow now before we get

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started I just want to say that this

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tutorial series is a bit more on the

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advanced side because there will be

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cloning and lists involved but I will

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try to make it as simple as possible so

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that is not too difficult to follow and

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hopefully by the end of the series

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you'll better understand how this in

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cloning works and of course have a tower

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defense game anyways let's get started

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so first of course we need a path for

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the enemies to follow so I'm going to

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create one by first going to the stage

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and then going to backdrops and then to

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make the path I'm gonna first select the

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line tool and then drag it across the

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drawing window over here and I think I'm

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gonna make the path start from down over

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here and then end somewhere over here

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alright and then now I'm gonna use the

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reshape tool to click anywhere on the

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line to create more points and then that

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way I can create a curvy path so if I

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just drag the point then I can move it

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and then if I drag the handles then I

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can change the steepness of the curve

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[Applause]

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[Music]

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all right so now I have my path down and

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now I'm gonna select my path and then

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change this outline number right here to

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something like let's say 80 okay maybe

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90 all right cool so now the path is

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much wider and I think I'm going to also

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change the fill color of the path to

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something like a brown oops sorry I

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meant the outline color so I'm gonna

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change the outline color to a brown

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color so something like this okay a bit

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darker all right and then I think I also

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want to add a green background so I'm

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gonna select this rectangle tool and

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then draw it over my entire drawing area

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and then I'm gonna first take out the

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outline so I'm gonna click this and then

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for the fill I'm gonna make it a green

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color so it's gonna sort of look like

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grass all right and then I'm gonna

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select a rectangle and then click the

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backwards button right here and now we

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have sort of like a grass field and a

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dirt path and I think I'm going to

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change the colors a bit more so and now

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that we're done with the path let's

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begin creating our enemy so first off

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let's go to our cats bright and then I'm

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gonna go to costumes and delete all of

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the current costumes and now for the

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enemy I think I'm just gonna start with

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a simple circle so I'm gonna select a

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circle tool and then I am going to hold

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shift while pressing down to create a

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perfect circle and then I'm going to

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Center it all right and I think for the

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enemy I'll make it a orange color so

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something like this and for the outline

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I will have a brown outline so something

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like this all right cool and now we have

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our enemy so I'm going to first show the

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enemy alright and then I'm also going to

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name it enemy and then I'm gonna

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position it somewhere down here okay and

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they also think it's a bit too large so

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I'm gonna make a size something like 60

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and okay I think that looks fine so now

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of course the next thing I want to do is

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to make the enemy move and to make the

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enemy follow this curved path we have we

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are going to need an invisible line to

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guide the enemy along this path so to

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start let's go to the stage and copy our

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current path so I'm gonna select this

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and then ctrl C and then I'm going to

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create a new sprite so paint alright and

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then paste so ctrl V and now we have our

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second path so this is gonna be the line

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which the enemies follow so I'm going to

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select this and then I'm going to take

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out all the outline or actually I'll

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leave some in so I'll make the outline

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something small like six alright and

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then I'll also make the outline color a

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white color just to make it clear that

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this is the path the enemy follows and

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then I'm also going to go to the code

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and then go to motion and then drag a go

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to X Y block and I'm gonna change this

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to go to X 0 and y 0 all right

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and now your line should be directly on

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top of your path this is gonna be the

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line that guides the enemy I'm going to

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keep the line shown for now but we can

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hide it later once we're done coding the

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enemy movement now let's go to our enemy

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sprite and go to costumes and then I'm

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gonna create two detection boxes for the

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enemy so let's duplicate the enemy

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costume twice so right-click duplicate

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and then inside of the first costume I

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am going to create a rectangle so I'm

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gonna first choose a fill I'm gonna make

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a rectangle blue alright and for this

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rectangle I'm gonna have no outline so

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I'm gonna click this okay and now I'll

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draw a small rectangle like

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this and I am going to position this

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rectangle so that it's in front of the

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enemy so somewhere around here and in

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this case I am imagining that the enemy

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is facing towards the right and then I'm

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also going to move this rectangle

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slightly above the middle of the enemy

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so as you can see it's not here but it's

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slightly above the middle part so

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somewhere around here all right and then

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I'm going to delete the enemy image so

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now for the second detection box I'm

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going to copy the first rectangle and

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then go to costume two and then paste it

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and then I'm gonna make this a red color

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so go to fill and then change it to red

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and by the way these colors are not

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necessary but I'm just choosing two

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different colors to know which detection

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box is which anyways I'm now going to

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move it so that it's slightly below the

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middle of the enemy so right around here

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alright and then I'm going to delete the

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enemy image all right so now we have our

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two detection boxes for with the enemy

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like this and these are going to check

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if they're touching the white line and

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if they are then they are going to

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rotate the enemy back into place so that

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it's always following the white line and

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this way the enemy will follow the path

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and turn if necessary by the way I'm

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also going to copy and paste these

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detection boxes in the real enemy

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costume so that we can see how the line

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detection works alright cool so this is

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our enemy and these two are the line

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detection boxes so now let's go inside

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oakley code and then let's drag a win

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flag clicked then I'm going to show the

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sprite and then I'm gonna of course make

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the enemy start over here so that is

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negative 133 and Y negative 172 all

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right and then I'm also going to make

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the enemy point in the direction of the

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white line so as you can see right now

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the two detection boxes are not facing

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towards the white line so I have to drag

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a point in Direction block and then

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change this to point in direction zero

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alright and then I also am going to move

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the enemy a bit to the right

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so maybe negative 127 okay so now as you

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can see the white line is now perfectly

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in between d2 detection boxes and now

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let's go back and then when the flag is

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clicked I'm also going to switch costume

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to costume 3 so that is the enemy

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costume alright so now for the enemy

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movement I'm going to create a new block

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and then I'm gonna call this something

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like enemy movement alright and then

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click OK and now we are going to do all

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of the line detection code in here so

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first off we have to go to variables and

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then I'm going to create two new

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variables the first one is going to be

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movespeed so this is how fast the

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enemies will move and I will select for

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despite only so click this and then

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click OK

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alright and then for the next one I am

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going to create a variable called turn

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speed and then I will select for despite

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only and then I'll click OK alright so

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first off inside of the enemy movement

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block I am going to go to motion and

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then drag a move ten steps and then I'm

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gonna go to variables and drag a move

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move speed steps so under the wind I

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clicked I can set the move speed

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variables and turn speed variables to

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whatever I want so let's say if I have a

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move speed of like four and turn speed

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of eight then the enemy will move four

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steps and it will also turn eight

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degrees when we code in d rotation so

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now back inside of the enemy movement

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block I am going to first go to looks

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and then drag a switch costume to block

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and then I'm gonna change this to switch

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costume to costume one so this is the

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blue detection box so for this one we

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are going to check if the enemy is

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currently and they go to sensing

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touching the white line or sprite one

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then the enemy is going to

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turn to the left or counterclockwise

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turn speed degrees all right and then

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now for the other detection box we can

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just right click duplicate and then

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switch costume to costume two which is

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the red detection box and then it will

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also check if it's touching sprite one

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and if it is then the enemy will turn to

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the right or clockwise turn speed

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degrees all right and then at the very

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end

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let's switch costume to costume three so

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what happens is that all of these blocks

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should run immediately after one another

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so the detection box costumes are never

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going to show because the enemy always

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switches to the real costume at the end

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however the detection boxes will still

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do their job and the blue one will check

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when it turned left or counterclockwise

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and the red one will check when to turn

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right or clockwise so I think that

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should work and one last thing let's go

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to control drag a further loop put it

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after the wind flag clicked and then

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let's go to my blocks and drag the enemy

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movement block inside of the for loop

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all right cool so let's try it out if I

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click the green flag so as you can see

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the enemy is following the white line

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and the red and the blue detection boxes

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are preventing the enemy from going

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outside of the white line like so and

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also one thing to keep in mind is that

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this doesn't always work the first time

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for example like if I set the move speed

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to eight instead of four then the enemy

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is gonna move too fast and then the line

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detection might not always work as you

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can see it did not properly detect right

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there and then the enemy went out of the

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line so if your enemy movement does not

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work like if it goes out of the track or

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something there are several ways for you

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to check and see what's wrong so first

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off make sure the enemy is pointing in

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the right direction so your detection

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boxes over here should be on the two

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sides of the white line and if they

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aren't then you should rotate your enemy

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so that they are and secondly try

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creasing your enemy move speed or

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increasing your enemy turn speed

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and I would say having a turn speed of

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around double the amount of your move

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speed is a good number to have but you

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can play around with it so for example

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if I have a move speed of six I'm gonna

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try a turn speed of 12 and then if I try

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the enemy then as you can see it should

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work all right cool

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looks good all right nice so it worked

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let me try a move speed of 10 and turn

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speed of 20 it's not going to look as

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good but alright so that seemed to also

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work but I would suggest having a slower

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move speed and that way the enemy turns

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would look more smooth and if everything

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still does not work try making sure your

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line is smooth and try decreasing how

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much the track turns so make sure to not

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have any sharp edges or anything like

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that anyways now that we're done with

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the enemy movement we can now hide the

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white line so inside of these looks we

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can grab a set color effect 2-0 block

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and then I'm gonna change this to set

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ghost effect to 100 and pretty much this

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just makes the line invisible but it

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still allows the enemy to touch the line

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so I'm going to drag a 1 Phi clicked and

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then put it after everything all right

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and then I'm also going to go to looks

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and drag a show block just in case and

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now that should be fine and then for the

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enemies bright I am going to go to the

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costumes and take out the red and blue

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colliders in the third costume so the

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first costume is gonna have the blue

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Clyde err second one's gonna have the

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red one and then third one is going to

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have your actual enemy sprite all right

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so now if you try it again then

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everything should work as normal okay

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we have the enemy and then it's touching

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the white line but the line is not shown

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so alright and then it should complete

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the track okay cool so now of course we

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also want the enemy to hide once it

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touches the edge of the track so let's

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go to the code

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and then I'm going to drag another wind

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fly clicked and then I'm gonna go to

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control drag a forever loop and then

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before that four of a loop I am going to

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drag a weight until block and I'm going

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to check wait until not and then sensing

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touching and change this to edge alright

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and then inside of the Farva loop I am

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going to always check if and then

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duplicate this touching the edge then

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hide so go to looks and then hide all

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right cool

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so of course since the enemy is touching

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the edge of the screen when it spawns we

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are going to ignore that until it stops

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touching the edge and then once it

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touches the edge again that means the

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enemy left the track so we're going to

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hide it so let's try it out and now as

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you can see it should work so once it

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touches the edge over here then it

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should hide so almost there

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and it is hidden all right cool

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so now that we have one enemy down let's

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now create multiple enemies and this is

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actually pretty simple all we have to do

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is go to control and then drag a repeat

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loop and then in psychotherapy loop

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let's drag a create clone of myself and

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also a wait one seconds

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and then I'll change this to something

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like wait 0.2 seconds and then I will

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take away everything under this one flag

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clicked and then drag this under the

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wind I clicked and I am NOT going to

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show the original enemy sprite so I'm

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going to go to looks and then drag a

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hide block and put it right before they

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repeat ten all right and then now for

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this part we are going to put this under

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a when I start as a clone so let's go to

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control and then I'm going to drag a

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when a star is a clone and then I'm also

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going to replace this one if I clicked

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with a when I star is a clone

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and now everything should be fine so

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let's try it out

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all right here are our enemies and as

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you can see we have 10 enemies going

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around the track and they should

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disappear once they reach the end and

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all right cool

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and they do all right so I think I am

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going to increase the move speed of the

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enemies a bit so maybe from 3 to 4 and

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let me try the same turn speed of 6 cell

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let's try it out ok here are our enemies

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and I think a turn speed of 6 is working

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fine so I'll leave it at that and there

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we go alright cool so now we have a

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simple and very customizable enemy

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movement system along with our track

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anyways that's it for this tutorial if

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you enjoyed it then give it a thumbs up

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00:17:51,110 --> 00:17:54,980
and subscribe to if you haven't already

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and the next tutorial I will begin

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creating some turrets to shoot the

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enemies by the way this project is

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shared on my scratcher file link is in

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the description below

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anyways that's for this video see ya

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[Music]